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SEASONAL VARIATIONS OF NUTRIENT BUDGETS IN JAKARTA BAY, INDONESIA Nugrahadi, Mochamad Saleh; Yanagi, Tetsuo; Tejakusuma, Iwan G.; Aji, Seno; Darmawan, Rahmania A.
Marine Research in Indonesia Vol 35, No 1 (2010)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/mri.v35i1.7

This study aims to quantify the fluxes of carbon, nitrogen, phosphorus, and silicate in Jakarta Bay and use these flux data to gain an initial understanding of the biogeochemical processes occurring in the system. We investigated water, suspended matter and sediments fluxes from estuarine, coastal water and outside of the bay. Water samples were analyzed for dissolved nutrients, chlorophyll-phytoplankton abundance, and their composition. Suspended matter and sediment were analyzed for carbon and nitrogen. Nutrient concentrations were high in the rivers or estuaries and then decreased rapidly seaward. Calculation budget results showed that Jakarta Bay is a sink for DIP, DIN and DSi during dry season and rainy season. In the dry season, the system is in the slightly fixation condition ([nfix-denit] = 0.03 mmol N m-2 d-1). In contrast, denitrification exceed nitrogen fixation ([nfix-denit] = -9.74 mmol N m-2 d-1) in the rainy season. Moreover, the bay produced net carbon about 2.6-32 mmol C m-2 d-1.

KAJIAN PENENTUAN LUAS TANAH DENGAN BERBAGAI METODE Aji, Seno
JURNAL AGRI-TEK Vol 15, No 2 (2014): JURNAL AGRI-TEK
Publisher : JURNAL AGRI-TEK

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (283.096 KB)

In general the measurement of land area can be used several simple tools. While for the measurement an accurate of land area then required a tools measurement namely theodolit. The resulting data from the measurements of theodolite which was horizontal angle, vertical angle, upper stadia, center stadia, lower stadia, and horizontal distance. There are several kinds of ways or method of determining the land area by counting broad in manner divide into several triangles, by counting coördinate, and by help program mapinfo 8.5. A method of calculating the land area by using program mapinfo 8.5 used as a reference method another in determination of the land area. To method of dividing the extent of land into several triangular obtained result is 1473,93 m2 and prosentase preciseness is 99,59 %. The method of calculating the land area by coördinate method obtained result is 1472,38 m2, and prosentase preciseness is 99,49 %. While the method of calculating the land area by using program mapinfo 8.5 obtained result is 1480 m2 with prosentase preciseness equal to 100 %.Keyword: the measurement, the land area, theodolite, program mapinfo 8.5.

Pemanfatan Bekas Spesi Untuk Pembuatan Spesi Baru Aji, Seno; Arif Bakhtiar E, Moh
JURNAL AGRI-TEK Vol 15, No 1 (2014): JURNAL AGRI-TEK
Publisher : JURNAL AGRI-TEK

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Generally, building residential or construction of buildings in indonesia using walls of masonry red both in finishing with stucco or without stucco. Aim of this study to determine the compressive strength value uses a new specie of the former specie aggregate results dismantling the wall and to determine the compressive strength value of comparison with the new specie aggregate (using natural sand aggregate Ngraho Bojonegoro). Specie siar recycle used in this study contains material was red brick, sand, red cement, lime and cement. Ingredient for all specie that used on the specimen testing using a ratio of 1 PC : 5 sand. the compressive strength value testing using a sample of a cube measuring 150 mm x 150 mm x 150 mm with 3 variations of the sample is 0% (without the former specie), 50% (with 50% of the former specie) and 100% (100% with the new specie using natural sand aggregate Ngraho Bojonegoro). the compressive strength value of Species from the recycle specie qualify as specie type O, with a minimum compressive.strength.value.is.24,5.kg/cm2.Key words : new specie, the former specie, species of siar, the compressive strength value.

Kajian Pembuatan Program Aplikasi Analisis Struktur Gedung Terhadap Beban Gempa Menggunakan Borland Delphi 6 Aji, Seno
JURNAL AGRI-TEK Vol 16, No 1 (2015): JURNAL AGRI-TEK
Publisher : JURNAL AGRI-TEK

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Indonesia is a country often occurring earthquakes because most of the islands of indonesia situated in regions that have the activity of the earthquake are enough high because indonsia areas located at the confluence of three main plates of the world namely indo-australia plates, eurasian and pacific. To research will be done the study analysis of the structure on the burden of building earthquake use borland delphi 6 with studies the structure of the building floors 4 which are located in the madiun with force concrete (fc) used is 25 MPa and yield strength for steel (fy) that is used is 320 MPa. The purpose of this research is to calculate the value of a shearing force the average the layer of soil, the burden of nominal basic sliding horizontally because of earthquake that work on the structure building, the distribution of the burden of high earthquake building along, time a trill fundamental natural structure, and performance service limits the structure of the building with used the results of the program design using language programming delphi 6. To analysis of the structure on the burden of earthquake used SNI 1726 2002. The results of design application program using borland delphi 6 shows that the results of the value of obtained have a value by a similar. The difference in the value of the results could happen if the data included data is the result of rounding.Keywords: Borland Delphi 6, application program, analysis of the structure, the burden of building earthquake.

KAJIAN EVALUASI DRAINASE KAWASAN JALAN SALAK KOTA MADIUN Aji, Seno
JURNAL AGRI-TEK Vol 16, No 2 (2015): JURNAL AGRI-TEK
Publisher : JURNAL AGRI-TEK

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The salak road often flooded a while during the rainy season. Drainage on the salak road in the rainy season was less than optimal in accommodating some run off sparking inundation points on the road. The rainfall data used in the planning was daily maximum rainfall data for 10 years observation (2004-2013) obtained from PSAWS Madiun. A calculation and recapitulation analysis frequency of rainfall with a method of distribution logs pearson type III. A drainage debits were calculated was discharge which was stored by the duct secondary I and II to put this in terms of water runoff from all regions actuall. The size of the discharge that may be accommodated by the drainage (Q drainage) was 0,782 m 3 /s the amount of discharge flood maximum was 1,0702 m 3 /s. So that capacity secondary drainage inadequate to accommodate discharge maximum because Qdrainage < Qmaksimum. Key Words: The salak road, the rainy season, flood, drainage.

SEASONAL VARIATIONS OF NUTRIENT BUDGETS IN JAKARTA BAY, INDONESIA Nugrahadi, Mochamad Saleh; Yanagi, Tetsuo; Tejakusuma, Iwan G.; Aji, Seno; Darmawan, Rahmania A.
Marine Research in Indonesia Vol 35 No 1 (2010)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/mri.v35i1.7

This study aims to quantify the fluxes of carbon, nitrogen, phosphorus, and silicate in Jakarta Bay and use these flux data to gain an initial understanding of the biogeochemical processes occurring in the system. We investigated water, suspended matter and sediments fluxes from estuarine, coastal water and outside of the bay. Water samples were analyzed for dissolved nutrients, chlorophyll-phytoplankton abundance, and their composition. Suspended matter and sediment were analyzed for carbon and nitrogen. Nutrient concentrations were high in the rivers or estuaries and then decreased rapidly seaward. Calculation budget results showed that Jakarta Bay is a sink for DIP, DIN and DSi during dry season and rainy season. In the dry season, the system is in the slightly fixation condition ([nfix-denit] = 0.03 mmol N m-2 d-1). In contrast, denitrification exceed nitrogen fixation ([nfix-denit] = -9.74 mmol N m-2 d-1) in the rainy season. Moreover, the bay produced net carbon about 2.6-32 mmol C m-2 d-1.

MPPT Based on Fuzzy Logic Controller (FLC) for Photovoltaic (PV) System in Solar Car Aji, Seno; Ajiatmo, Dwi; Robandi, Imam; Suryoatmojo, Heri
Journal of Mechatronics, Electrical Power and Vehicular Technology Vol 4, No 2 (2013)
Publisher : Research Centre for Electrical Power and Mechatronics, Indonesian Istitutes of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/j.mev.2013.v4.127-134

This paper presents a control called Maximum Power Point Tracking (MPPT) for photovoltaic (PV) system in a solar car. The main purpose of this system is to extracts PV power maximally while keeping small losses using a simple design of converter. Working principle of MPPT based fuzzy logic controller (MPPT-FLC) is to get desirable values of reference current and voltage. MPPT-FLC compares them with the values of the PV's actual current and voltage to control duty cycle value. Then the duty cycle value is used to adjust the angle of ignition switch (MOSFET gate) on the Boost converter. The proposed method was shown through simulation performed using PSIM and MATLAB software. Simulation results show that the system is able to improve the PV power extraction efficiency significantly by approximately 98% of PVâ€™s power.

Korelasi Wabah â€œDemam Berdarah Dengue/ DBDâ€ dengan Tingkat Curah Hujan Rata â€“ Rata Tristono, Tomi; Aji, Seno
JURNAL DAYA-MAS Vol 5, No 2 (2020): DAYA MAS
Publisher : Universitas Merdeka Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33319/dymas.v5i2.49

Abstractâ€” Along with the arrival of the rainy season in October 2018 - April 2019, the awareness of the emergence of Dengue Fever needs to be improved. Several methods for anticipation have been carried out, including by improving environmental cleanliness and holding mosquito spray or Fogging. These methods are considered to be ineffective in breaking the growth chain of Aedes Aegypti, which is the type of mosquito that most spreads Dengue Fever. To prevent infection, the World Health Organization (WHO) has also suggested controlling mosquito populations and protecting people from mosquito bites. This research uses the comparative method of Dengue Fever data in 2015, 2016, and 2017 of Jombang Regency. The data is correlated with average rainfall. Based on observations, the cases of Dengue Fever are repeated every year. The health office must socialize what dengue fever is, what are the symptoms, how to treat it if infected, and how to prevent it. The community needs to improve the cleanliness of the environment and be aware of water reservoirs or puddles if the rainy season. The presence of Jumantik cadres is very urgent and needed.Â Keywordsâ€”: Dengue Fever; rainy season; Aedes Aegypti; cleanliness of the environment.

Analisis Stabilitas Sheet Pile Kali Sono Kota Madiun Aji, Seno; Rohman, Rosyid Kholilur; Cahyono, Setiyo Daru
JURNAL PILAR TEKNOLOGI : Jurnal Ilmiah Ilmu Ilmu Teknik Vol 5, No 2 (2020): JURNAL PILAR TEKNOLOGI
Publisher : LPPM Universitas Merdeka Madiun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33319/piltek.v5i2.57

Abstractâ€” Slope slides can occur if the specific gravity of the land working as the driving force is greater than the shear stress that serves as a restraining force. To prevent landslides there are several methods that can be used, one of them is using sheet pile as a soil barrier. Besides working to hold the soil, the sheet pile also functions to prevent the entry of water into dug pits, so it is very good to be used at the edge of the sea or river. The formulation of the problem that arises is how the value of active and passive soil pressure on the sheet pile, as well as how the suitable CPC Sheet Pile specifications are used in this study. The research method used is geotechnical analysis for sheet pile retaining walls. Based on soil data and calculation analysis, the value of active soil pressure on sheet pile is 104.06 kN / m and the value of passive soil pressure is 206.19 kN / m2. The CPC Sheet Pile specification used is Type W-600A, 15 meters long with Mcrack = 50.6 Ton.meter.Â Keywordsâ€”: Slope slides; sheet piles; the value of active and passive; geotechnical analysis.

DETERMINING TRAVEL DELAY OF VEHICLES QUEUE AT A TRAFFIC SIGNAL Cahyono, Setiyo Daru; Tristono, Tomi; Aji, Seno; Utomo, Pradityo
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 14 No 3 (2020): BAREKENG: Jurnal Ilmu Matematika dan Terapan
Publisher : MATHEMATIC DEPARTMENT, FACULTY OF MATHEMATICS AND NATURAL SCIENCES, UNIVERSITY OF PATTIMURA

Mathematical modelling assumes that the vehicleÃ¢â‚¬â„¢s volume has a uniform pattern. Due to traffic lights settings, the number of vehicles queue grows linearly. The reality, the stochastic arrivals of the vehicles could be (1) in the randomized arrivals, (2) in the form of groups/ platoon, or (3) in the mixed arrivals. It is observed that the arrival of the vehicles in the queue tends to have a normal pattern. The objective of this research is to study the implications of the arrival categories to the travel delay. For simulation, it uses the numerical method referring to the real state. The result indicates, determining travel delay become precise for all vehicles. It is due to the travel delay formula is represented as a discrete function. The arrival time, departure time, and stop time for each vehicle at the signalized intersection are recorded in the device

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